freemarker 自定义变量

<span style="white-space:pre">	</span><#assign voteIds='' />
        <#assign voteNames='' />
        <#if (wendaQuestion.voteList)?? && (wendaQuestion.voteList)?size gt 0>
        <#list (wendaQuestion.voteList) as vote>
            <#assign voteIds = voteIds + vote?if_exists.id?if_exists +',' />
            <#assign voteNames = voteNames + vote?if_exists.voteDescribe?if_exists +',' />
        </#list>

        </#if>
        <input type="hidden" id="voteIds" value="${voteIds!''}">
        <input type="hidden" id="voteNames" value="${voteNames!''}"><span style="white-space:pre">	</span><#assign